Rotary-disk file



Oct. 1, 1929. H. P. LAMBERT 1,729,881

ROTARY DISK FILE Filed Nov. 2, 1928 A TTORNEYS'.

Patented Oct. 1, 1929 PTE .OFFICE HOMER PLLAMBERT, or ANDERSON, INDIANAROTARY-DISK FILE Application filed November 2, 1928. Serial No. 316,648.

This invention relates to rotary disk files particularly adapted todressing down surfaces of wood, metal and the like, substantially asexplained in my former application,

cSerial No. 265,7 20, filed March 29, 1928. In

rotary'files ofthis character which attain extremely high rotary speed,there is great danger of the centrifugal force, combined with thelateral pressure and the binding aclo'tion, causing distortion'which mayinterfere with theproper ope'ration of the file or breakage which mayinjurethe operator by parts being thrown.

Probably the most important object of the invention is to'properly alignthe rotary disk file soxthat it-will alwaysrun'true in its rotarymovementand will-not be distorted because "of misalignment'thereof. Thisobject is accomplished by securing'the disk file peripherally and'centrallyto arigidback plate or casing which reenforces and holds thesame in true alignment.

Another object of the invention is to construct a rotary disk file sothat the operator .2 will beprotected fromany breakage or flying'partsinthe'use of the device. To that end the disk file is peripherally"surrounded and its'rear surface enclosed by'arigidand relatively heavyback plate or casing. The

3 rotary file is secured thereto'both centrally and peripherally androtates therewith so that the margin and the'back of the'disk-file iswholly covered and protected.

Another objectis the control of the dust discharge during the operationof the file. Without any such control, a stream of'dust is dischargedrearward against the operator and he must constantly work in that streamof dust. A dust chamberis provided inthis invention between the rear ofthe rotary disk file and said reenforcing back plate or casingfrom whichthe dust escapes centrifugally through outlet openings in'theperiphery'of the protecting plate or casing. Gentrifugal forceof thedevice causes centrifugal air movement through said outlet openingswhich carries with it the dust and discharges it-out beyond the normalworking position of the operator.

The :full nature of the invention will be understood from theaccompanying drawings and the following description and claims:

In the drawings Fig. 1 is aside elevation of the apparatus showing it as-applied to a piece of work, parts being broken away. Fig. 2 is a frontelevation of the apparatus with some of the cutting teeth-shown and themajor portion thereof omitted. Fig. 3 is a central vertical sectionthrough the apparatus in condition for use. Fig. 4 is a similar sectionof the apparatus, while being assembled and prepared for use.

In the drawings there is shown a rotary disk file 10 being a hardenedsteel disk with a large number of burrs or cuttingteeth 11 thereon andperipherally punched through the same and adapted to engage and dressdown protruding surfaces of wood or other work 12 in order to smooth andproperly dress the same. 'Said file is'rotated at'high speed by means ofthe drive shaft 13. The disk file 10 is provided with'an annular andcentrally positioned recess to cause the central portion 14 of'the disk10 to extend rearward and behind the operating plane of the diskfilesothat the-binding nut 18 forholdingit in-place on the threadedportion .15 of the-shaft 13 will'not'protrude forward .into the plane ofthe burrs or cutting teeth 11, as'shown.

The rotary disk'10 is'provided with arearwardly extendingmarginal edge21 aboutits periphery which strengthens and slightly stifi'ens the file.The disk file is further strengthened,materially by the flanged edge 21being enveloped in a soft metal ring 22. The ring22 is secured on aflange 2l by spot welding or other suitable means.

The entire disk file so far described is then secured on a relativelyheavy thick back plate 25 of disk form and of substantially the samediameter as the disk 10 and having means for securing the margin andcentral portions to said back plate or disk 25. Thus, said back platehas on its side next to the file disk 10 a chamber 26 surroundingcentral boss 27 which surrounds the threaded part 15 of the shaft 13',as shown.

Saidback plate 25 also has amarginalrim 28 with a series of radiallyextending holes or apertures 29 through said marginal rim for the entirecircumference of the device. Also said marginal rim 28 has an annulargroove at 30 in the front face thereof for seating the annular portionofthe file disk 10 including its marginal flange 21 and reenforcing softmetal ring 22, as appears clearly in Figs. 3 and 4:.

The above parts are assembled substantially as illustrated in Fig. 4 bythe file disk 10 being seated on one side of the back plate 25 with themarginal rim of the former in the annular recess 30 in the rim. 28 ofthe latter, and with both members 10 and 25 mounted on the threadedportion 15 of the shaft 13. In that position the rearwardly extendingportion 14 of the disk 10 is adjacent to but slightly spaced from theboss 27 on the rigid back plate 25. When the nut 18 is tightened down,it will spring the central part of the'disk file 10 against the boss 28of the back plate and bring the parts, when finally assembled forworking, into the position shown in Fig. 3. Then the file disk will besprung into its working position so as to be securely held against therigid back plate 25 and all parts of the disk file 10 be maintained inconstant true alignment.

The foregoing device constructed as above explained renders theapparatus very rigid and strong and yet the file disk, which is made ofhardened steel, has its usual characteristics, rendering it suitable forits work. By reason of its sprung position in the center and the seatingof its marginal ring 22 in the groove 30 of the back plate, its perfectalignment is assured and also the durability of its mounting.

The back plate 25 protects the rear side of the disk file from beingengaged by workmen and also the marginal periphery thereof is protectedby the rim of said back plate which is peripherally smooth. Likewise,said.

' back plate prevents any distortion of the disk file and any breakagethereof so that the workman will receive no injury from that cause.Furthermore, the workman will be protected from any rearwardly movingcolumn of dust, as the dust which will enter chamber 26 of the backplate and pass out centrifugally through the peripherial openings 29beyond the working position of the workman.

the central part of the back plate, substantially as and for thepurposes set forth.

2. A rotary file comprising a metal disk with a cutting surface on oneside thereof, a rigid circular back plate, a driving shaft centrallymounting said disk and said back plate with the margin of said disk inengagement with the rim of the back plate and the central part of thedisk file normally spaced from the central part of said back plate whennot clamped thereto, and means for clamping the central part of the diskfile under tension against said back plate, substantially as set forth.

3. A rotary file comprising a metal disk having a cutting surface on oneside and a rearwardly extending marginal flange, a

rigid circular back plate with a rim having an annular groove in itsfront face in which said marginal flange of the disk file is imbedded, adriving shaft extending centrally through both of said members with ashoul der behind and adjacent to the back face of said back plate andthe forward end of said shaft threaded, and means on the shaft forclamping the central part of the disk file against the central part ofsaid back plate, substantially as set forth.

4. A rotary file comprising a metal disk having a cutting surface on oneside and a rearwardly extending marginal flange, a rigid circular backplate with a rim having an annular groove in its front face in whichsaid marginal flange of the disk file is imbedded, a driving shaftextending centrally through both of said members with a shoulder behindand adjacent to the back face of said back plate and the forward end ofsaid shaft threaded, the central part of said disk file being spacedaway from the central part of said back plate when not under tension,

and a nut on the front end of the shaft for clamping the central part ofsaid disk file under tension against the central part of the back plate,substantially as set forth.

5. A rotary file comprising a metal disk with a cutting surface on oneside thereof, a rigid circular back plate, a driving shaft on which saidtwo members are centrally mounted with said disk held against the backplate,

said back plate being recessed in its front face to form a dust chamberbehind the metal disk and with dust outlet openings in the rim of the'back plate, substantially as set forth.

6. A rotary file comprising a metal disk with a cutting surface on oneside thereof and having a rearwardly inset central portion and aninwardly extending marginal flange on the periphery thereof, a rigidcircular back plate with a central forwardly extending boss and aforwardly extending rim with an annular groove in the front face of therim, Whichreceives the rearwardly extending marginal flange of the diskfile, and said back plate being recessed to form a dust chamber in thefront face thereof behind said disk file and with dust outlet openingsin the rim of said back plate, a driving shaft with a threaded portionextending centrally through said disk file and said back plate and ashoulder against the rear face of the back plate, and a nut on theforward end of the shaft clamping said disk against said back plate,substantially as set forth.

In Witness whereof, I have hereunto affixed my signature.

HOMER P. LAMBERT.

